The Exterior Panels

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'When the triptych's wings are closed, the design of the outer panels becomes visible. Rendered in a green–graygrisaille,[11] these panels lack colour, probably because most Netherlandish triptychs were thus painted, but possibly indicating that the painting reflects a time before the creation of the sun and moon, which were formed, according to Christian theology, to "give light to the earth".[12] It was common for the outer panels of Netherlandish altarpieces to be in grisaille, such that their blandness highlighted the splendid colour inside.[13]' Wiki

I never knew this!! SO beautiful!

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